551800009 has 2 divisors, whose sum is σ = 551800010. Its totient is φ = 551800008.

The previous prime is 551799977. The next prime is 551800021. The reversal of 551800009 is 900008155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 337089600 + 214710409 = 18360^2 + 14653^2 .

It is a cyclic number.

It is not a de Polignac number, because 551800009 - 2⁵ = 551799977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 551800009.

It is not a weakly prime, because it can be changed into another prime (551800309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275900004 + 275900005.

It is an arithmetic number, because the mean of its divisors is an integer number (275900005).

Almost surely, 2^551800009 is an apocalyptic number.

It is an amenable number.

551800009 is a deficient number, since it is larger than the sum of its proper divisors (1).

551800009 is an equidigital number, since it uses as much as digits as its factorization.

551800009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 551800009 is about 23490.4237722524. The cubic root of 551800009 is about 820.2141067914.

The spelling of 551800009 in words is "five hundred fifty-one million, eight hundred thousand, nine".